ScoutingRediscovered on "centering bottom widgets in Mog Theme"

Hello! I solved the problem thanks to the help of a user on the CSS Tricks forums . If anyone's interested (and for future reference), here is my current code:

/* Secondary area */
#secondary{
    margin: 0px auto;
    padding: 2em 0;
    border-top: 0px rgb(170, 170, 170);
    width: 100%;
    max-width: 720px;
}

#search{
    text-align: center;
    float: none;
    width: auto;
    margin-bottom: 1.5em;
}

aside.widget{

    float: left;
    margin: 0px auto;
    width: 33.33%;
    height: auto;

}